Oh thanks! I actually was wondering if it was safe to get different kinds of corys.

It's safe to get different kinds of cories as long as they are the same species. Cories school with members of their own species and will only school with members of other species out of necessity like when there are only two cories in the tank. They are much less stressed when hanging out in groups of at least 4 with members of the same species. You happened to pick the species that has three color morphs though. There's bronze, albino, and green. They will all school together, they can spawn will each other, etc. I like this species because I have several of the different colors in my tank and I can tell all my fish apart. I am having a little difficulty now that the babies are getting bigger--one looks exactly like the dad and is getting close in size to daddy.

Edit: I forgot to mention that if you ever see a big tank with multiple cory species in it you will see the proper schooling behavior. The store I got two of my fish from had a huge cory specific tank with peppered cories, bronze cories, albino cories, and panda cories. They all stayed will similar sized fish that were the same species as them. It's really pretty cool.